Agricultural Sciences Memo 1 (English)

Feb-March 2015 — Grade 12 / Matric — Agricultural Sciences

Memo 2015 Grade 12 English Agricultural Sciences Hub →

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🎯 150 marks 📄 9 pages 📝 68 items found 📚 2 topics

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Q1— Section header —

1.1.10(10 x 2\ (20\

1.2.5Both A and B nly A only None nly (5 x 2\ (10\

1.3.5Biological value/BV Zinc/Zn Plywood Oogenesis/ovigenesis Reproductive (5 x 2\ (10\

1.4.5Pearson Maintenance Rectum Acrosome Embryo transfer (5 x 1\ (5\ TOTAL SECTION A:

2.1Alimentary canals of two farm animals

2.1.1Type of digestive systems represented by: (a\ Ruminant (b\ Cattle/ cows/ sheep/goat/game (c\ Non

2.1.2Letter and name where hydrochloric acid is secreted in diagram A Abomasum/true stomach /milk stomach (2\

2.2Planning fodder flow feed flow and fodder flow production

2.2.1Definition of fodder flow A strategic plan o ensure enough fodder To meet the requirements of all the animals Throughout the year In terms of quality and quantity (Any 2\ (2\

2.2.2Aspects in planning for a fodder flow (a\ Economic viability: The farmer to take measures of ensuring that the fodder is cost effective/cheap (b\ Sustainability:

2.3Digestibility co efficiency

2.3.1Calculation of digestibility co efficiency DC = Dry matter intake (kg\ dry mass of manure (kg\ Dry matter intake (kg\ 1 kg x = 3,75

2.3.2Implication of the answer in QUESTION

2.3.1The bulk of the feed (62,35%\ is digested and absorbed by the heifer The lesser percentage of the feed (37,65%\ was not digested hence not absorbed by the heifer (2\

2.4A table on the nutritive ratio (NR\

2.4.1The ration most suitable for the following: (a\ Fattening of old ewes (b\ Ewes in the last 4 weeks of pregnancy (c\ Young growing animals (3\

2.4.2Reason for the ration in 2.4.1(a\ Ratio is wide Feed has higher lipid/carbohydrate/energy content Feed has lower protein content Ewes need more energy than protein (Any 1\ (1\

2.4.3Ration with high levels of: (a\ Maize (b\ Fish meal (2\

2.4.4The implication of the nutritive ratio of ration B Ration has higher protein content Recommended for growth, production and reproduction Ration has lower lipid/carbohydrate/energy content (Any 2\ (2\

2.5Diagram on mineral supplements

2.5.1Method of mineral supplement Mineral lick (1\

2.5.2TWO minerals that could be supplemented Calcium Sodium Phosphorus Nitrogen (Any 2\ (2\

2.5.3The partial protein substitute Non protein nitrogenous substance ( NPN biuret /urea (1\

2.5.4Role of growth regulators (a\ Hormones will stimulate metabolic reactions that will lead in increased growth rate (b\ Antibiotics will provide immunity

Q3— Section header —

3.1Animal production systems

3.1.1Identification of animal production systems. A: Extensive production system B: Intensive production system (2\

3.1.2Comparison of the TWO production systems (a\ Capital investment Low capital/technology input in extensive production system and large capital/technology input in intensive production system (b\ Area/space of land occupied

3.1.3TWO examples of intensive production system Cage Battery (layers/broilers\ Deep litter system (Any 2\ (2\

3.2Structures/practices for handling animals

3.2.1A single strand of movable electrical wire (1\

3.2.2A rope with a halter to tie animals to a pole (1\

3.2.3A separate crush (1\

3.2.4Single strand of movable electric wire (1\

3.3Scenario on solar radiation

3.3.1THREE measures to reduce heat stress under intensive conditions Spray/ Fogger with water Insulation Fans/conditioners/ventilators Housing systems/orientation (Any 3\

3.3.2Correlation between high environmental temperature and feed consumption The higher the temperature the less the feed intake (2\ ie

3.4Data on average body temperature and pulse rate in dairy cows

3.4.1Line graph on the volume of stimulant and the growth response Line graph of growth stimulants against growth response Criteria/marking guidelines Correct heading axis correct labelling (growth response\

3.4.2TWO growth stimulants used in animal production systems Thyroid regulators Hormones Antibiotics Tranquilisers (Any 2\ (2\

3.4.3Growth response of the heifers at a volume of 15 ml 395 kg (1\ 100 150 200 250 300 350

3.5Internal parasites

3.5.1Identification of the type of a parasite Internal parasite (1\

3.5.2

3.5.3How the animal is infected The animal will ingest Metacercaria through grazing (2\

3.5.4Intermediate host Snail (1\

3.5.5THREE asture management measures of controlling Internal parasite Rotational grazing Resting of infected pastures Allowing animals that are resistant to specific internal parasites Avoid wet places Use of zero grazing

Q4— Section header —

4.1The diagram below represents the reproductive canal of a farm animal

4.1.1Process in part D Spermatogenesis (1\

4.1.2Identify parts A and E Label A Seminal vesicles/vesicular glands Label B Vas deferens/sperm duct Label Scrotum/scrotal sac (3\

4.1.3TWO congenital defects of part D Cryptorchidism the condition whereby the testes remain in the abdominal cavity and do not descend into the scrotum Hypoplasia the condition whereby the testes are underdeveloped

4.1.4TWO functions of the part C Storage of semen Maturation of sperms Secretion of buffer Transportation of semen Concentration of semen (Any 2\ (2\

4.2Oestrus

4.2.1Oestrus It is a period when non pregnant female animals are receptive to male animals/allow mating (2\

4.2.2THREE signs of oestrus Vulva is swollen/reddish Mucous discharge Cow is restless and bellows often Mounting other cows Isolation Decrease in food intake/loss of appetite Legs and flanks are muddy Allows mating

4.2.3THREE practical methods to identify cows on heat Observation of animal behaviour Place a bull in pen near the cows Bulls marked with a chin ball marker Tail paint on tail head/tail paint markers Heat mount detectors

4.3Graph of Oestrogen/Progesterone levels in a cow over 22 days

4.3.1Day cow will mate with a bull Day 4 (1\

4.3.2Motivation Highest level of oestrogen Cow will be on heat (2\

4.3.3Day of ovulation Day 4 (1\ ie

4.3.4Stage when progesterone is highest Met oestrus (1\

4.3.5Whether cow became pregnant Cow did not become pregnant Motivation Progesterone levels declined/decreased fter day 16 (1\ (2\

4.4Modern technologies: artificial insemination (AI\, synchronization etc.

4.4.1Description of synchroni ation of oestrus Making the oestrus cycle of a number of female animals to occur approximately at the same time (2\

4.4.2THREE advantages of AI in dairy cows Improving the genetic quality of the offspring No need to buy/manage expensive bulls Can use semen of one bull to inseminate many cows Prevents the spread of sexually transmitted diseases

4.4.3FOUR sequential stages used in ET Synchronisation of oestrus in donor and recipient cows Superovulation of donor cows Insemination of donor cows Washing of the embryo from the uterus Transfer embryo into the uterus of recipient cows

Topics Identified

Animal ProductionAgricultural Management

Mark Allocation

Total150 marks

Sections35 + 35 + 35 = 105 marks

Paper information

SubjectAgricultural Sciences

Year2015

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages9

Downloads6

Examination context

Decade2010s

Years ago11y

Season—

Start day—

Exam period—

Days since exam—

About Agricultural Sciences examination preparation

Grade 12 Agricultural Sciences combines scientific knowledge with the application and interpretation of agricultural concepts.

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